记一次SYSAUX表空间清理

查看v$sysaux_occupants确认占用空间对象select occupant_name,space_usage_kbytes from v$sysaux_occupants order by space_usage_kbytes desc;查询结果：SM/ADVISOR 32741952通过dba_segments进一步确认select segment_name,owner,tablespace_name,bytes/1024/1024"SIZE(MB)",segment_type from dba_segments where tablespace_name='SYSAUX' order by bytes desc;查看结果：WRI$_ADV_OBJECTS SYS SYSAUX 14497 TABLEWRI$_ADV_OBJECTS_IDX_01 SYS SYSAUX 6907 INDEXWRI$_ADV_OBJECTS_IDX_02 SYS SYSAUX 5761 INDEXWRI$_ADV_OBJECTS_PK SYS SYSAUX 4804 INDEX原因：因为在12.2中，引入了新的特性：optimizer statistics advisor。优化器统计信息顾问每天都会在维护窗口运行，auto_stats_advisor_task多次运行，因而会消耗大量sysaux表空间。解决方案：1、删除statistics advisor task(auto_stats_advisor_task),删除该任务后就可以释放统计信息顾问产生的数据declarev_tname varchar2(32767);beginv_tname :='AUTO_STATS_ADVISOR_TASK';dbms_stats.drop_advisor_task(v_tname);end;/在删除任务的过程中，可能会遇到下面的错误：ORA-20001:Statistics Advisor: Invalid TaskName For thecurrent user如果遇到上面的错误，可以先重建AUTO_STATS_ADVISOR_TASK来解决问题：SQL>connect as sysdbaSQL>EXEC DBMS_STATS.INIT_PACKAGE();删除任务后，重新组织表和索引alter table wri$_adv_objects move;alter index wri$_adv_objects_idx_01 rebuild;alter index wri$_adv_objects_idx_02 rebuild;alter index wri$_adv_objects_pk rebuild;如果 WRI$_ADV_OBJECTS 记录过多，delete以上会占用较大undo,可以把想要的数据存储在临时表，truncate table WRI$_ADV_OBJECTS,再insert回来。create table wri$_adv_objects_new tablespace ticket_dataas select * from wri$_adv_objectswhere task_id !=(select distinct idfrom wri$_adv_taskswhere name='AUTO_STATS_ADVISOR_TASK');SQL> select count(*)from wri$_adv_objects_new;COUNT(*)----------2968insert /*+ APPEND */ into wri$_adv_objectsselect * from wri$_adv_objects_new;truncate后查看空间占用：select OCCUPANT_NAME,OCCUPANT_DESC,SPACE_USAGE_KBYTES/1024 USAGE_MBfrom V$SYSAUX_OCCUPANTSorder by SPACE_USAGE_KBYTES DESC;SM/ADVISOR Server Manageability - Advisor Framework 6.18752、缩短任务执行历史的保存时间确认当前设定的保持期间(30天或UNLIMITED)修改设定的保持期间可以通过下面的命令，将EXECUTION_DAYS_TO_EXPIRE修改为15天，即执行历史数据的保存时间为7天：connect as sysdbaBEGINDBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER (task_name => 'AUTO_STATS_ADVISOR_TASK', parameter => 'EXECUTION_DAYS_TO_EXPIRE', value => 15);END;/3、也可以禁用该任务，而不是删除。declarefilter1 clob;beginfilter1 := dbms_stats.configure_advisor_rule_filter('AUTO_STATS_ADVISOR_TASK','EXECUTE',NULL,'DISABLE');END;/